5. Jeff Buckley - Hallelujah (originally by Leonard Cohen)

Our #GreatestCovers No.5 is the landmark version by the late American musician Jeff Buckley, appearing on his only completed album, 1994’s Grace. It belatedly reached No.2 in 2008 at the same time as X Factor winner Alexandra Burke's version was Christmas No.1, the first time since 1957 that the same song occupied both No.1 and No.2 in the UK charts.

4. The Jimi Hendrix Experience - All Along The Watchtower (originally by Bob Dylan)

All Along The Watchtower is a classic twice over. Bob Dylan's version was released in 1967 and has become one of the prolific songwriter's best known songs.

The Jimi Hendrix Experience's version was recorded in London the following year and appeared on their seminal Electric Ladyland album, becoming an instant classic and Hendrix's biggest-selling single.

3. The Stranglers - Walk On By (originally recorded by Dionne Warwick)

Walk On By was written by one of pop music's greatest songwriting teams - composer Burt Bacharach and lyricist Hal David - and originally recorded by legendary American vocalist Dionne Warwick in 1964.

UK punk rock band The Stranglers gave a very different feel to the track with their 1978 version, with Warwick's soulful sounds replaced with singer Hugh Cornwell's menacing snarl, to memorable effect.

2. Johnny Cash - Hurt (originally by Nine Inch Nails)

Influential experimental rock act Nine Inch Nails, helmed by Trent Reznor, recorded Hurt in 1994 for the dark and intense album The Downward Spiral.

When country legend Johnny Cash covered the track in 2002 Reznor was worried that the song would be "gimmicky", but after watching the music video he revised his opinion, becoming a vocal fan of Cash's haunting rework of his track.

1. Pet Shop Boys - Always On My Mind (made famous by Elvis Presley)

Neil Tennant chats to Radio 2's Simon Mayo about their cover of the Elvis classic.

Originally written as a country song in 1972, Always On My Mind was made famous by Elvis Presley when he released his recording later that year, and it remains one of the King’s best-loved hits.

UK synth-pop duo the Pet Shop Boys originally performed their cover in 1987 for a TV show commemorating Elvis. Their version was so well-received that they decided to record it for release. It went on to become that year’s Christmas No.1 and now it's your #GreatestCovers No.1 as well!